With the configuration field Use ticker rate you can select which values of the exchange tickers should be used.
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Highest bid / Lowest ask
When selected the highest bid or lowest ask value of the exchange ticker is used. -
Use last if higher/lower
When selected the last price on the exchange ticker will be used instead of the highest bid or lowest ask value. -
Always use last tick
When selected the last price on the exchange ticker will always be used. Highest bid and lowest ask will be ignored.